The condo is located near BTS Phrakhanong. However, since it is located on Sukhumvit road, some noise should be taken into account. There is a market 5 minutes away, so you can easily buy fruits or local food.
Most of all, the best thing was the host. The host is very fluent in English.
After making a reservation, he replied quickly to any questions, contacted me a few days before check-in, and waited for me even when I checked-in. Also, whenever I contacted him during his stay, he always replied quickly.
When I checked out, he came at the appointed time and I trusted to calculate the electricity bill.